x,y,k,p = map(int,input().split())

turn = x+y-k

first = (turn+1)//2
second = turn//2

# print(turn,first,second)
if turn%2:
    first,second = second,first

def ans(x,turn):
    turn %= 2
    # print(x,turn)
    if x == 0:
        print("Bob" if turn else "Alice")
    else:
        print("Bob" if turn == 0 else "Alice")
    exit()

if first >= y and pow(-1,y%2) == p:
    ans(0,turn)
    
if first >= x and pow(-1,(turn-x)%2) == p:
    ans(0,turn)

ans(1,turn)